Hot-air furnace



W. J. DOYLE AND J. J. WOLLENHAUPT.

HOT MR FURNACE.

APPLICATION FILED OCT. 1!, I9I5.

1,340,134, Patented May 11, 1920.

2 SHEETS-SHEET l.

W. J. DOYLE AND J. J. WOLLENHAUPT. HOT AIR FURNACE.

APPLICATION FILED OCT. 1!, 1915. 1 ,340, 134. Patented May 11, 1920.

2 SHEETS-SHEET 2- 2/ r i U 1 Q1 4 I /r I 3 I: ,4:

J 1 I I UNITED smr1 z s PATENT orrrcn.

WILLIAM J. DOYLE AND JUS'IUS J. WOLLENHAUPT,

OF CINCINNATI, OHIO, ASSIGNORS TO THE MONITOR STOVE & RANGE COMPANY, OI CINCINNATI, OHIO, A CORPORA- rron "or. one.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed October 11, 1915. Serial No. 55,180.

To all whom it may concern Be it known that we, WILLIAM J. DOYLE and JUsTUs J. WOLLENHAUPT, citizens of the United States, and residing at Cincinnati in the county of Hamilton and State of ()hio, have invented a new and useful Improvement in Hot-Air Furnaces, of which the following specification is a full disclosure.

The invention relates to an improvement in hot-air furnaces, and to a type in which the heater and casings, providing cold air intake and hot air exit passages, are combined into a unitary structure, the air passages surrounding the heater and intercommunicating at a point below the heatin zone of the heater.

ot air furnaces of the ,type to which this invention is directed are usuall of large structure, wherein the heater 0 the furnace is surrounded by a plurality of casings spaced apart and formmg an outer downward cold-air passage around the heater, which will prevent any heating of i the room in which the furnace is installed, which is a very desirable feature when the installation is made in the cellar of a building. It is very frequently desirable in making basement room installation, to heat the furnace room, and, therefore, it is an object of the invention to provide an independent hot-air chamber within the furnace casing communicatin with the room in which the furnace is installed.

Another object of the invention is to provide an inde endent hot-air chamber within the casing of a hot-air furnace, between the front face plate and the heater, around the fuel and ash-pit passages extending from the heater to the face plate, for heating the room in which the furnace is located, the chamber communicating with the room through the openings through the face plate.

The features of the invention are more fully set forth in the description of the accompan ing drawings, formlng a part of this speci cation, in wh1ch:-

Figure 1 is a front elevation of the furnace.

Fig. 2 is a perspective view of the intermediate casing and partition plate, the cone portion of said casing being removed.

Fig. 3 is a side elevation with the casings partly broken away and in section.

4 is a plan section on line 4-4,

his invention, as an improvement in furnaces, contains the eneral features de scribed and claimed in atent No. 1,133,242, to William J. Doyle and Justus J. Wol lenhaupt, dated March 23, 1915, and characteristic to such type of furnace known to the trade as a pipeless furnace or system of heating, wherein the furnace serves as a means for withdrawing the cold air from the connected apartment, conveying it to the heater to be heated and again delivering it into the apartment, heating all the connected rooms.

In the construction illustrated, the furnace comprises unitarily a heater and hot and cold air passages, connecting through a register with a room immediately above the furnace. The heated air rises, forcing the colder air downward, and by the suction of the furnace, into and downwardly through the cold air passage and then upwardly into and through the hot air passage around the heater, to be heated and delivered into the apartment.

The air when heated expands, increasing its velocity which has a resulting effect on the velocity of the incoming cool air. When the furnace is started, the circulation is relatively active, but gradually slows down, as the air enterin the inlet approximates the temperature 0 the air emerging from the outlet, so that when the predetermined temperature has been attained and rendered substantially uniform throughout the house, the circuation is relatively passive and may be maintained by running the furnace at a relatively low heat. Thus the diiference in degrees of temperature between the incoming and outgoing air determines the velocity automatically accelerated when the variance in temperature is marked and more sluggish when the temperature approaches degrees of uniformity.

Air maintained'in circulation in an apartment through its variation in temperature and heating does not foul or become impure as rapidly'as when the air is stagnant, in fact it is maintained that in heating and circulating the air under the system above noted, the air is continuously purified. But as the temperature of the air equalizes in the apartment, its circulating velocity is reduced, so that the advanta e of the furnace as an air purifier is to a degree lost unless the de ree of temperature is constantly increase which would be objectionable. It is, therefore, that we provide means for admitting a supply of fresh air entrained in the air circuit through the furnace and preferably entering the cold air )assage of the furnace near its inlet end. he fresh air is drawn into the cold air assage and downwardly with the descen ing low tem erature air from the apartment with whic the furnace connects. The influx of cold air does not interfere with the air circulation through the apartment or furnace, as the passage is valve-controlled and the amount of air admitted may be regulated toestablish and maintain a perfect circulation of air at all times.

In some instances it is also desirable to heat the room in which the furnace is located and to this end, we provide a separate air heating passage having openings at different elevations communicating directly with said room.

The heater in its construction comprises the ash-pit 1, fire-box 2, combustion chamber casing 3 and hot-air radiator 4, of separable sections detachably united, following an established practice in the art. The passages 5, 6,.extend forwardly to communicate with door openings in the face plate 7, said face plate being a part of the outer casing. The heater is surrounded by a manifold number of casings spaced from each other and from the heater, including an outer casing B fixed to and supported upon the base plate 9 and fixed to the face plate. The casing 8 terminates with a contracted portion 10 which connects with a register 11. A second or intermediate casing 13 is concentrically supported within the outer casing 8 and spaced therefrom to provide a cold air passage 12. This intermediate casing is suitably supported to extend slightly below the heating zone, the passage 12 being in free communication with the hot-air chamber or passage 14.. The upper portion 18 of the casing 13 is contracted and terminates with a vertically extended portion 15 connected with the register 11.

Concentrically within the intermediate casing 13, spaced therefrom and suitably supported, we provide an inner casing 16, providing a passage 17 open at the top and bottom. A portion of the cold air drawn in through the cold air passage 12 enters the assage 17 and thereby provides insulation or the casing 13.

To convey fresh air to the cold air assage 12, we (provide a fresh air pipe or not 20 connecte to the outer casing at a point above the heating zone and leading to the exterior of the building. A damper 21 in said pipe and fixed to an axis projecting through the pipe controls the air supply.

The vertical edges of the casing 13 are flanged as at 22, (see Fig. 4) and with the ends of the casing 8 connected plate 7. Secured to and projectinginwardly from each flange 22 are partitionplates 23 having their inner edges contoured to closely fit the outer surface of the heater. The top edges of the flanges 22 are joined by a top plate 24 and a plate 25 joining the top ed es of the plates 23 and resting on top of t e front edge of the radiators forms a continuation of the top plate 24.

The partition plates 23 extend slightl below the heating zone and together wit the flanges 22 and top plates 24, 25, form a separate passa e 26 independent from the passages 12 an 17 Within the area of this passage, 26, we provide cold air intakeopenings 27 and hot air exit openin 28 in the form of grilled openings in the fiat plate 7. The suction of the furnace draws the air in the furnace room through the cold air openings 27 and upwardly through the assage 26, deriving heat from the heater. he heated air is then forced out into said room through the exit openings 28.

Having described our invention, claim In a furnace of the character described, a heater having fuel and ash-pit passages projecting horizontally therefrom, a face plate connected to the ends of said passages, said face plate having apertures therethrough above each of said passages, providing respectively air intake and exit openings, an outer casing surrounding and spaced from the heater and connecting at opposite sides to sides of the face plate, and a casing inclosing said passages between the face plate and heater and orming a chamber communicating with the face late openings.

In witness whereof, we, ereunto subscribe our names, as attested by the two subscribing witnesses.

WILLIAM J. DOYLE.

JUSTUS J. WOLLENHAUPT. Witnesses:

EMMA SPENER,

L. A. Bnox.

with the fac'e 

